US7715423B2 - Communication terminal device and communication method - Google Patents
Communication terminal device and communication method Download PDFInfo
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- US7715423B2 US7715423B2 US11/231,964 US23196405A US7715423B2 US 7715423 B2 US7715423 B2 US 7715423B2 US 23196405 A US23196405 A US 23196405A US 7715423 B2 US7715423 B2 US 7715423B2
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- identification information
- communication terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L12/2838—Distribution of signals within a home automation network, e.g. involving splitting/multiplexing signals to/from different paths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L2012/2847—Home automation networks characterised by the type of home appliance used
- H04L2012/285—Generic home appliances, e.g. refrigerators
Definitions
- the present invention contains subject matter related to Japanese Patent Application JP 2004-287850 filed in the Japanese Patent Office on Sep. 30, 2004 and Japanese Patent Application JP 2004-292022 filed in the Japanese Patent Office on Oct. 4, 2004, the entire contents of which are incorporated herein by reference.
- the present invention relates to communication terminal devices and communication methods, and in particular, to a communication terminal device and communication method suitable for use in communication based on, for example, TCP/IP (Transmission Control Protocol/Internet Protocol).
- TCP/IP Transmission Control Protocol/Internet Protocol
- Communication protocols of the related art for use in TCP/IP communication include a protocol called “UPnP (Universal Plug and Play)” (see, for example, UPnP Forum, [online], the Internet searched on Jul. 2, 2004 for the URL, http://www.upnp.org).
- UPnP Universal Plug and Play
- UPnP enables not only automatic mutual detection of devices on a network but also recognition of the configuration and function of each device.
- communication can be controlled so that an operating device can stop supplying power to an operated device.
- UPnP establishes communication on the condition that there are correspondences between the devices on the network and unique IP addresses assigned to the devices.
- DHCP Dynamic Host Configuration Protocol
- the correspondences also change, thus resulting in a situation in which communication control of a device to be operated is mistakenly performed. It is assumed that, when the devices are connected via a wireless LAN (local area network), such a situation may often occur in response to a change in topology form.
- the present invention has been made in view of the above circumstances. It is desirable to provide a communication terminal device and a communication method that easily improve effectiveness of communication control.
- a communication terminal device for performing communication based on a communication protocol defined so that first identification information assigned to the communication terminal device is transmitted to and received from a communication party
- the communication terminal device including an identification information generating means which, based on information unique to the communication terminal device, generates second identification information different from the first identification information, a storage means which stores a table representing a correspondence between the second identification information generated by the identification information generating means and the type of the communication terminal device, and a control means which controls the storage means so that communication with the communication party is established based on the table.
- the control means transmits the second identification information and type of the communication terminal device to unspecified destinations with predetermined timing, and updates the table based on second identification information and type of the communication party which are sent back as a response to the transmission from the communication party.
- a communication method for performing communication based on a communication protocol defined so that first identification information assigned to a communication terminal device is transmitted to and received from a communication party including the steps of, based on information unique to the communication terminal device, generating second identification information of the communication terminal device which is different from the first identification information, storing a table representing a correspondence between the generated second identification information and the type of the communication terminal device, and transmitting the second identification information and type of the communication terminal device to unspecified destinations with predetermined timing and updating the table based on second identification information and type of the communication party which are sent back as a response to the transmission from the communication party.
- the communication terminal device in the case of performing communication based on a communication protocol defined so that first identification information assigned to a communication terminal device is transmitted to and received from a communication party, by, based on information unique to the communication terminal device, generating second identification information of the communication terminal device which is different from the first identification information, storing a table representing a correspondence between the generated second identification information and the type of the communication terminal device, and transmitting the second identification information and type of the communication terminal device to unspecified destinations with predetermined timing and updating the table based on second identification information and type of the communication party which are sent back as a response from the communication party, the communication terminal device can communicate with the communication party based on the table irrespective of a state in which the first identification information is assigned.
- FIG. 1 is a block diagram showing the entire configuration of a communication system according to an embodiment of the present invention
- FIG. 2 is a block diagram showing the functional configurations of communication terminal devices
- FIG. 3 is a sequence chart showing an updating process
- FIGS. 4A to 4D are schematic illustrations showing second updating processes
- FIG. 5 is a sequence chart showing an executing process
- FIGS. 6A to 6C are schematic illustrations showing executing processes
- FIG. 7 is a sequence chart showing a network-setting changing process
- FIGS. 8A to 8D are schematic illustrations showing network-setting changing processes
- FIG. 9 is a block diagram showing the configuration of a communication terminal device
- FIG. 10 is a schematic illustration showing the configuration of a query packet (response packet).
- FIG. 11 is an illustration of operation codes
- FIG. 12 is a timing chart showing re-sending timing
- FIG. 13 is an illustration of the configuration of a command packet
- FIG. 14 is an illustration of specific contents stored in fields
- FIG. 15 is an illustration of an affirmative acknowledgement packet
- FIG. 16 is an illustration of a negative acknowledgement packet
- FIG. 17 is an illustration of examples of fields which are extended to an “extra” field (or a “cmd dependent” or “option” field);
- FIG. 18 is an illustration of an example of a network setting detail display screen.
- FIG. 19 is an illustration of an example of a setting-input screen.
- FIG. 1 shows the entire configuration of a communication system 1 that includes a personal computer 2 , a hard disk video recorder 3 , and a router 4 which are connected as communication terminal devices to one another by a local area network (LAN).
- LAN local area network
- the personal computer 2 in the communication system 1 functionally includes a LAN-based module section (hereinafter referred to as a “LAN module section”) LM 2 , a communication control section CC 2 for a communication control function, and a user interface section YI 2 for a function such as a graphical user interface (GUI).
- LAN module section a LAN-based module section
- CC 2 a communication control function
- GUI graphical user interface
- the hard disk video recorder 3 and the router 4 respectively include LAN module sections LM 3 and LM 4 , and communication control sections CC 3 and CC 4 .
- the communication control sections CC 2 to CC 4 are based on TCP/IP commonly used as a set of standard communication protocols. By mutually transmitting and receiving unique IP addresses assigned to the communication control sections CC 2 to CC 4 through the LAN module sections LM 2 to LM 4 , which corresponds to the IP addresses, each communication control section can recognize the correspondence between one IP address and one communication terminal device, and can communicate with a desired communication party on the basis of the result of the recognition.
- Each of the communication control sections CC 2 to CC 4 can generate a unique identifier different from an IP address, and can store the correspondence between the unique identifier and type of a corresponding communication terminal device in table form (hereinafter referred to as an “identifier-to-type correspondence table”).
- Each communication control section (CC 2 , CC 3 , CC 4 ) transmits and receives the unique identifier and the type together with the IP address.
- the communication control section stores, in the identifier-to-type correspondence table of the corresponding communication terminal device, the IP address of a communication party, the unique identifier, and the type in mutually associated form, and updates the table, if necessary. Based on its identifier-to-type correspondence table, the communication control section can specify and communicate with a communication party.
- the communication control section CC 2 in the personal computer 2 can detect as changes in the state of the personal computer 2 , a power supply (activation) instruction to the personal computer 2 , an instruction to return from a power saving mode for saving power consumption, a LAN connection notifying signal for reporting connection to the LAN, etc.
- the communication control section CC 2 After detecting a change in the state, the communication control section CC 2 generates, as a query packet (B_QUERY), the type KD PC and unique identifier ID PC of the personal computer 2 which are registered beforehand in the identifier-to-type correspondence table TB PC of the personal computer 2 , and broadcasts the query packet from the LAN module section LM 2 , as shown in FIG. 4A .
- B_QUERY a query packet
- the type KD PC and unique identifier ID PC of the personal computer 2 which are registered beforehand in the identifier-to-type correspondence table TB PC of the personal computer 2 , and broadcasts the query packet from the LAN module section LM 2 , as shown in FIG. 4A .
- the communication control section CC 3 in the hard disk video recorder 3 receives the query packet through the LAN module section LM 3 , it records, based on the query packet, the type KD PC and unique identifier ID PC of the personal computer 2 in the identification-to-type correspondence table TB HDR of the hard disk video recorder 3 .
- the communication control section CC 3 generates, in the form of a response packet (B_RESPONSE), type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 which are registered beforehand in an identification-to-type correspondence table TB HDR of the hard disk video recorder 3 , and broadcasts the response packet from the LAN module section LM 3 .
- the communication control section CC 4 in the router 4 registers, in an identification-to-type correspondence table TB RT of the router 4 , the type KD PC and unique identifier ID PC of the personal computer 2 , and broadcasts the type KD RT and unique identifier ID RT of the router 4 in the form of a response packet.
- the communication control section CC 2 in the personal computer 2 receives the response packets broadcast from the hard disk video recorder 3 and the router 4 through the LAN module section LM 2 , it registers, in the identifier-to-type correspondence table TB PC of the personal computer 2 , the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 and the type KB RT and unique identifier ID RT of the router 4 on the basis of the received response packets. After that, the communication control section CC 2 discards the response packets.
- the personal computer 2 stores the identifier-to-type correspondence table TB PC updated to include the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 and the type KD RT and unique identifier ID RT of the router 4 .
- the communication control section CC 3 in the hard disk video recorder 3 registers, the identification-to-type correspondence table TB HDR of the hard disk video recorder 3 , the type KD RT and unique identifier ID RT of the router 4 , and subsequently discards the response packet.
- the communication control section CC 4 in the router 4 registers, in the identification-to-type correspondence table TB RT of the router 4 , the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 , and subsequently discards the response packet.
- the hard disk video recorder 3 stores the identification-to-type correspondence table TB HDR updated to include the type KD PC and unique identifier ID PC of the personal computer 2 and the type KD RT and unique identifier ID RT of the router 4 .
- the router 4 stores the identification-to-type correspondence table TB RT updated to include the type KD PC and unique identifier ID PC of the personal computer 2 and the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 .
- the personal computer 2 can update their identification-to-type correspondence tables TB PC , TB HDR , and TB RT .
- each communication control section broadcasts the type and unique identifier of each communication terminal device, it transmits he assigned IP address (IA PC , IA HDR , IA RT ) in accordance with the User Datagram Protocol (UDP), and can register, in the identification-to-type correspondence table of the communication terminal device, the type and unique identifier of another communication terminal device which are received from another communication control section in a form in which the received type unique identifier are associated with the IP address transmitted in accordance with the UDP.
- IP address IA PC , IA HDR , IA RT
- UDP User Datagram Protocol
- the communication control section CC 2 in the personal computer 2 detects a change in the state of the personal computer 2
- the communication control section CC 3 in the hard disk video recorder 3 detects a change in the state of the hard disk video recorder 3
- the communication control section CC 3 broadcasts a query packet
- the communication control section CC 2 in the personal computer 2 and the communication control section CC 4 in the router 4 broadcast response packets, whereby, similarly to the above case, the identification-to-type correspondence table of the hard disk video recorder 3 (or CC 4 ) is updated.
- a communication terminal device which detects a change in its state, serves as an origin to start the updating process, the communication terminal device as the origin and the other communication terminal devices exchange their types and unique identifiers, whereby their identification-to-type correspondence tables are updated.
- each communication terminal device can communicate with a communication party without depending on an IP address on the basis of its identification-to-type correspondence table that is automatically updated in response to a change in its state.
- the communication system 1 can prevent a situation in which immediacy until establishing the communication is damaged.
- the personal computer 2 including the user interface YI 2 can function as a master for the hard disk video recorder 3 and the router 4 which do not include the user interface YI 2 . Accordingly, the personal computer 2 can control the hard disk video recorder 3 and the router 4 by using its identifier-to-type correspondence table TB PC .
- this control process is broadly divided into a process (hereinafter referred to as an “executing process”) that controls the hard disk video recorder 3 and the 4 so as to execute processing such as power supplying and video recording, and a process (hereinafter referred to as a “network-setting changing process”) that controls the hard disk video recorder 3 and the router 4 to change network settings.
- executing process controls the hard disk video recorder 3 and the 4 so as to execute processing such as power supplying and video recording
- a process hereinafter referred to as a “network-setting changing process” that controls the hard disk video recorder 3 and the router 4 to change network settings.
- the communication control section CC 2 in the personal computer 2 can detect an operating instruction to a communication terminal device in the communication system 11 which is supplied from an external network or the user interface YI 2 to the communication system 1 .
- the communication control section CC 2 detects the operating instruction, and specifies a communication terminal device designated by the operating instruction, as shown in FIG. 6A , the communication control section CC 2 generates and unicasts a command packet including, for example, the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 , and a command corresponding to processing specified by the operating instruction.
- the communication control section CC 3 in the hard disk video recorder 3 determines whether the unique identifier ID HDR in the command packet coincides with the unique identifier ID HDR of the hard disk video recorder 3 which is registered in the identification-to-type correspondence table TB HDR .
- the communication control section CC 3 executes processing, specified by the operating instruction, such as power supplying or video recording.
- the communication control section CC 3 generates, as an affirmative response to the command packet, an acknowledgement packet (ACK) including the result of executing the processing, and unicasts the acknowledgement packet to the personal computer 2 .
- ACK acknowledgement packet
- the communication control section CC 3 discards this command packet, and unicasts, as a negative response to the command packet, a negative acknowledgement packet (“NACK” in FIG. 5 ) including a cause of no execution of processing corresponding to the command in the command packet.
- NACK negative acknowledgement packet
- the personal computer 2 unicasts the above command packet again in accordance with the cause of no execution of the processing corresponding to the command.
- the personal computer 2 can control the communication terminal device to execute processing corresponding to the command irrespective of an IP address assignment state of the communication terminal device.
- the communication system 1 by transmitting, to the personal computer 2 , electronic mail including an operating instruction from, for example, a cellular phone or the like via the Internet, a user can remote-control a corresponding communication terminal device through the personal computer 2 .
- the communication control section CC 2 in the personal computer 2 detects a network-setting collecting request from the user interface YI 2 , it generates and broadcasts a command packet (B_COMMAND) including codes representing all the unique identifiers of all the communication terminal devices and a command to request reporting network settings at present.
- B_COMMAND a command packet including codes representing all the unique identifiers of all the communication terminal devices and a command to request reporting network settings at present.
- the communication control section CC 3 in the hard disk video recorder 3 After the communication control section CC 3 in the hard disk video recorder 3 receives the command packet, it generates and broadcasts, as a response to the command packet, an acknowledgement packet (B_ACK) including its network settings at present.
- B_ACK acknowledgement packet
- the communication control section CC 4 in the router 4 generates and broadcasts, as a response to the command packet, an acknowledgement packet (B_ACK) including the network settings at present of the hard disk video recorder 3 .
- B_ACK acknowledgement packet
- network settings at present of the communication terminal devices (the hard disk video recorder 3 and the router 4 ) on the LAN can be automatically transmitted to the personal computer 2 .
- the communication control section CC 2 in the personal computer 2 displays, on a display section, through the user interface YI 2 , the network settings at present of the personal computer 2 in the acknowledgement packet.
- the communication system 1 enables the user to confirm network settings of a communication terminal device on the LAN without a user's operation on the communication terminal device.
- the communication control section CC 2 When, in this state, the user operates the user interface YI 2 so as to change the network settings of, for example, the hard disk video recorder 3 , the communication control section CC 2 generates a command packet (B_COMMAND) including the changed network settings and the type KD HDR and unique identifier ID HDR of the hard disk video recorder 3 , as shown in FIGS. 7 and 8A to 8 D, and broadcasts the command packet, as shown in FIG. 8A .
- B_COMMAND command packet
- the communication control section CC 3 in the hard disk video recorder 3 After the communication control section CC 3 in the hard disk video recorder 3 receives the command packet, as shown in FIG. 8B , it determines whether the unique identifier ID HDR in the command packet coincides with the unique identifier ID HDR of the hard disk video recorder 3 which is registered in the identification-to-type correspondence table TB HDR .
- the communication control section CC 3 changes the network settings of the hard disk video recorder 3 to the changed network settings, and broadcasts, as a response to the command packet, an acknowledgement packet (B_ACK) including the result of executing processing, as shown in FIG. 8C .
- the communication control section CC 4 in the router 4 can recognize whether the command packet is addressed to the router 4 on the basis of the identification-to-type correspondence table TB RT of the router 4 . In this case, since the unique identifier ID HDR in the command packet does not coincide with the unique identifier ID RT of the router 4 , the communication control section CC 4 discards the command packet, as shown in FIGS. 8B and 8C .
- network settings of a communication terminal device on the LAN which does not include the user interface YI 2 can be displayed and changed.
- the user can confirm network settings of a communication terminal device on the LAN without operating the communication terminal device and can change the network settings, if necessary.
- FIG. 9 shows a hardware configuration common to the functional sections LM 2 , CC 2 , and YI 2 , LM 3 and CC 3 , and LM 4 and CC 4 ( FIG. 2 ), the hard disk video recorder 3 , and the router 4 as the communication terminal devices.
- the communication terminal device (each of the personal computer 2 , the hard disk video recorder 3 , and the router 4 ) includes a central processing unit (CPU) 10 , and a read-only memory (ROM) 11 , a random access memory (RAM) 12 as a work memory, a storage memory 13 storing an identification-to-type correspondence table TB, an operating section 14 , a display section 15 , a communicating section 16 , and a clock section 17 that are connected to the CPU 10 by a bus 18 .
- CPU central processing unit
- ROM read-only memory
- RAM random access memory
- the CPU 10 loads a program stored in the ROM 11 into the RAM 12 , if necessary, and executes processing in each set of the functional sections LM 2 , CC 2 , and YI 2 , LM 3 and CC 3 , and LM 4 and CC 4 by controlling the storage memory 13 , the display section 15 , the communicating section 16 , and the clock section 17 in accordance with the loaded program.
- the CPU 10 transmits, from the communicating section 16 to another communication terminal device via the LAN, various data items such as a query packet, a response packet, a command packet, an acknowledgement packet, or audio-video data, and manages a retransmission time or the like of the packet based on a count value in the clock section 17 .
- the CPU 10 can update the contents of the identification-to-type correspondence table TB stored in the storage memory 13 , if necessary.
- specific processing in the updating process is divided into an updating process in a communication terminal device (hereinafter referred to as an “originating communication terminal device”) serving as an origin for the updating process and an updating process in each of communication terminal devices (hereinafter referred to as “intermediate communication terminal devices”) other than the originating communication terminal device.
- originating communication terminal device serving as an origin for the updating process
- intermediate communication terminal devices each of communication terminal devices
- the CPU 10 in the originating communication terminal device detects a power supplying (activation) instruction or a return instruction to return from a standby mode (power saving mode) supplied from the display section 15 , or a LAN-connection notification signal supplied from the communicating section 16 , the CPU 10 generates the query packet QP shown in FIG. 10 .
- This query packet QP includes fields F 1 to F 5 corresponding to 1-byte “op”, 1-byte “reserve”, 2-byte “src type”, 4-byte “xid”, and 16-byte “srcID”, respectively.
- the “op” field F 1 stores an operation code representing a packet type.
- the “reserve” field F 2 stores an item that is defined in future.
- the “src type” field F 3 stores a code representing type KD of the originating communication terminal device.
- the “xid” field F 4 stores random characters provided for each packet in order to ensure packet correspondence.
- the “srcID” field F 5 stores the unique identifier ID of the originating communication terminal device.
- the unique identifier ID is formed by a value (initial value) generated based on an MAC address, and can be rewritten by a proper noun such as “Mr. ______′a PC”, or the like, if necessary.
- the operation code has the following assigned values.
- the value “1” is assigned to the query packet (B_QUERY).
- the value “2” is assigned to the response packet (B_RESPONSE).
- the value “3” is assigned to the command packet (COMMAND) for unicast.
- the value “4” is assigned to the acknowledgement packet (ACK) for unicasts.
- the value “5” is assigned to the negative acknowledgement packet for unicast.
- the value “6” is assigned to the command packet (B_COMMAND) for broadcast.
- the value “7” is assigned to the affirmative acknowledgement packet (B_ACK) for broadcast.
- the value “8” is assigned to the negative acknowledgement packet (B_NAK) for broadcast.
- the “op” field F 1 of the query packet QP has “1”
- the “src type” and “srcID” fields F 3 and F 5 store the type (KD) code and unique identifier ID registered beforehand in the identification-to-type correspondence table TB of the originating communication terminal device, respectively.
- the CPU 10 broadcasts the query packet QP through the communicating section 16 .
- the type KD and identifier ID of each intermediate communication terminal device (the personal computer 2 , the hard disk video recorder 3 , or the router 4 ) connected to the LAN in the communication system 1 , and a request to collect the type KD and identifier ID of the intermediate communication terminal device are delivered to the intermediate communication terminal device irrespective of an IP address assignment state.
- the CPU 10 awaits a response packet RP ( FIG. 10 ) broadcast, as a response to the query packet QP, from the intermediate communication terminal device.
- the response packet RP is obtained by changing the items in the fields F 1 , F 3 , and F 5 of the query packet QP.
- the “op” field F 1 stores an option code (i.e., “2” ( FIG. 11 )) for the response packet RP instead of the option code (i.e., “1” ( FIG. 11 )) for the query packet QP.
- the “src type” and “srcID” fields F 3 and F 5 respectively store a code representing the type KD of the intermediate communication terminal device which broadcasts the response packet RP, and the identifier ID of the intermediate communication terminal device instead of the type KD and identifier ID of the originating communication terminal device. Therefore, the type KD and identifier ID of the intermediate communication terminal device are delivered to the originating communication terminal device irrespective of the IP address assignment state of the originating communication terminal device.
- the CPU 10 When the CPU 10 receives the response packet RP through the communicating section 16 , it determines whether the received response packet RP responds to the query packet QP broadcast by the CPU 10 on the basis of the character stored in the “xid” field F 4 of the response packet RP.
- the received response packet RP does not respond to the query packet QP broadcast by the CPU 10 , it is indicated that there is another communication terminal device, connected to the LAN in the communication system 1 , serving as an origin to transmit the query packet QP.
- the originating communication terminal device serves as an intermediate communication terminal device to perform the updating process.
- the CPU 10 registers the type (KD) code in the “src type” F 3 and the unique identifier ID in the “srcID” F 5 in a form in which both are associated with each other.
- the CPU 10 registers the code in the “src type” field F 3 which represents the type (KD) code and the unique identifier ID in the “srcID” field F 5 in a form in which both are associated with each other.
- the CPU 10 discards the response packet RP.
- the CPU 10 can re-broadcast the query packet QP after one second, two seconds, and five seconds from the time the CPU 10 initially broadcasts the query packet QP, as shown in FIG. 12 .
- the CPU 10 avoids repeated registration to the identification-to-type correspondence table TB by, whenever receiving-the response packet RP, determining whether the character in the “xid” field F 4 and the unique identifier ID in the “srcID” field F 5 are identical to those in the previously received response packet RP.
- the CPU 10 If, even after eight seconds elapse from initial-transmission, the CPU 10 does not receive the response packet RP which responds to the type KD and unique identifier ID already registered in the identification-to-type correspondence table TB of the communication-terminal device, the CPU 10 can delete the type KD and the corresponding unique identifier ID from the identification-to-type correspondence table TB.
- the CPU 10 can broadcast the query packet QP and can update the identification-to-type correspondence table TB of the originating communication terminal device in response to the result of receiving the response packet RP responding to the query packet QP and the registered contents of the identification-to-type correspondence table TB of the originating communication terminal device. Accordingly, the originating communication terminal device can grasp another communication terminal device connected to the LAN in accordance with broadcasting of the query packet QP.
- the LAN-connection signal is supplied to the communicating section 16 , for example, when a new communication terminal device connects to the LAN or re-connects to the LAN.
- the CPU 10 in the intermediate communication terminal device receives the query packet QP ( FIG. 10 ) through the communicating section 16 , similarly to the case of the above originating communication terminal device, the CPU 10 updates the identification-to-type correspondence table TB of the originating communication terminal device by registering a new type KD and unique identifier ID in response to the type (KD) code and unique identifier ID in the “src type” field F 3 and “srcID” field F 5 of the query packet QP, and the registered contents of the identification-to-type correspondence table TB of the originating communication terminal device.
- the CPU 10 can change the field F 1 of the query packet QP received that time.
- the CPU 10 can generate the response packet RP by changing the fields F 3 and F 5 to corresponding items of the identification-to-type correspondence table TB of the originating communication terminal device, and can broadcast the generated response packet RP.
- the intermediate communication terminal device can update the identification-to-type correspondence table TB of the intermediate communication terminal device in response to the result of receiving the query packet QP and the registered contents of the identification-to-type correspondence table TB of the intermediate communication terminal device. Accordingly, the intermediate communication terminal device can grasp for example, a state in which a new communication terminal device connects to the LAN, and re-connection to the LAN.
- the detailed processing of the communication terminal device in the executing process is divided for description into a requesting process of a communication terminal device (hereinafter referred to as a “main communication terminal device”) on a controlling side and a responding process of a communication terminal device (hereinafter referred to as a “sub communication terminal device”) on a controlled side.
- a main communication terminal device a communication terminal device
- a responding process of a communication terminal device hereinafter referred to as a “sub communication terminal device”
- the CPU 10 in the main communication terminal device detects an operating instruction which is supplied from the operating section 14 or the communicating section 16 to the sub communication terminal device
- the CPU 10 generates the command packet CP based on the content of the operating instruction and the identification-to-type correspondence table TB stored in the storage memory 13 .
- the command packet CP includes, in addition to the fields F 1 to F 5 ( FIG. 10 ) for “op”, “reserve”, “src type”, “xid”, and “srcID”, a 16-byte “dstID” field F 6 , an 1-byte “command” field F 7 , a 3-byte “cmd dependent” field F 8 , and an n-byte “option” field F 9 (n 1, 2, 3, . . . ).
- the “dstID” field F 5 stores the unique identifier ID of the sub communication terminal device
- the “command” field F 7 stores a code representing a command corresponding to processing specified by the operating instruction.
- the “cmd dependent” field F 8 stores an item related to the command
- the “option” field F 9 stores an extended item, if necessary.
- the “command” F 7 stores, for example, the following commands: “Change State” for requesting the execution of power-related processing such as power supplying, power supply stopping, power-saving-mode processing, and power-saving-mode cancellation, “GetState” for requesting reporting which one of an operable state and inoperable state the sub communication terminal device is in, that is, which of an power-on state and standby state (power saving mode) the sub communication terminal device is in, “Replay” that is used for a replay concerning whether the execution of processing corresponding to each of various commands impossible or difficult, “Ext Command” for requesting the execution of processing other than the power-related processing among various types of processing by the sub communication terminal device, and “Ext Replay” that is used for a reply concerning whether reception of the “Ext Command” is possible or difficult.
- “Change State” for requesting the execution of power-related processing such as power supplying, power supply stopping, power-saving-mode processing, and power-saving-mode cancellation
- GetState for requesting reporting which one of an oper
- a code that represents the power supplying specified by an operating instruction, or the type of other processing, is stored as an item associated with the command, if necessary.
- the processing type is described in a predetermined language, if necessary.
- the “op” field F 1 of the command packet CP stores an option code (i.e., “3” in FIG. 11 ) for the command packet for unicast
- the “src type” field F 3 and the “srcID” field F 5 respectively store a code representing the type KD PC and unique identifier ID PC of the main communication terminal device.
- the “dstID” field F 5 stores the unique identifier ID of the sub communication terminal device which is specified by the operating instruction
- the “command” field F 7 stores the code of “Change State” (“1” in this embodiment).
- the “cmd dependent” field F 8 ( FIG. 13 ) includes a 1-byte “state flag” field and a 2-byte “reserve” field. In the “state flag” field, one of flags corresponding to the standby state (power saving mode), an off state, restart, etc., is stored as a specific type of processing related to the power.
- the CPU 10 unicasts the above command packet CP through the communicating section 16 .
- the type of processing specified by the operating instruction is delivered to the sub communication terminal device (the hard disk video recorder 3 or the router 4 ) specified by the operating instruction irrespective of the IP address assignment state of the sub communication terminal device.
- the CPU 10 awaits, as a response to the command packet CP, the affirmative acknowledgement packet APA shown in FIG. 15 or the negative acknowledgement packet APD shown in FIG. 16 which is unicast from the sub communication terminal device.
- the affirmative acknowledgement packet APA includes an n-byte “extra” field F 10 in addition to the fields F 1 to F 5 ( FIG. 10 ) for “op”, “reserve”, “src type”, “xid”, and “srcID”.
- the negative acknowledgement packet APD includes a 4-byte “reason” field F 11 in addition to the fields F 1 to F 5 for “op”, “reserve”, “src type”, “xid”, and “srcID”.
- the “extra” field F 11 a result in response to the command in the command packet CP ( FIG. 13 ), or the like, is stored, if necessary.
- a cause of no execution of processing in response to the command in the command packet CP is stored.
- the “reserve” field M 2 and the “xid” field F 4 are identical in stored content to the corresponding fields F 2 and F 4 .
- the option code i.e., “14” or “5” in FIG. 11
- the acknowledgement packet AP APA or APD
- the “src type” field F 3 and “srcID” field F 5 a code representing the type KD of the sub communication terminal device which transmits the acknowledgement packet and its unique identifier ID are stored, respectively.
- the CPU 10 When the CPU 10 receives the acknowledgement packet AP through the communicating section 16 , the CPU 10 stops the requested processing if the acknowledgement packet AP is identified as an affirmative acknowledgement packet APA, and, if the acknowledgement packet AP is identified as a negative acknowledgement packet APD, unicasts the above command packet CP again in response to the cause stored in the “reason” in the negative acknowledgement packet APD.
- the main communication terminal device can request the communication terminal device to execute the processing specified by the operating instruction.
- the CPU 10 in the sub communication terminal device (the hard disk video recorder 3 or the router 4 ) receives the command packet CP ( FIG. 13 )
- the CPU 10 determines whether the unique identifier ID stored in the “dstID” field F 5 coincides with the unique identifier ID of the sub communication terminal device which is registered in the identification-to-type correspondence table TB of the sub communication terminal device.
- the CPU 10 executes processing corresponding to contents in the “command” field F 7 , the “cmd dependent” field F 8 , and the “option” field F 9 , the CPU 10 generates and unicasts the above affirmative acknowledgement packet APA ( FIG. 15 ).
- the CPU 10 If the unique identifier ID in the command packet CP does not coincide with the unique identifier ID of the sub communication terminal device, the CPU 10 generates and unicasts the negative acknowledgement packet APD ( FIG. 16 ).
- the sub communication terminal device only when the sub communication terminal device receives the command packet CP corresponding to its unique identifier ID does it execute processing corresponding to the content of the command packet CP.
- the CPU 10 in the main communication terminal device detects a change command to change network settings which are supplied from the operating section 14 , the CPU 10 generates the command packet CP shown in FIG. 13 on the basis of the content of the change command and the identification-to-type correspondence table of the main communication terminal device.
- command field F 7 of the command packet CP a code corresponding to the command “GetNetConf” for requesting sending back of network settings at present is stored, and, in the “dstID” field F 7 , the code “FF” representing all the sub communication terminal devices as receivers of the command packet CP is stored in order to broadcast the command packet CP.
- the option code (i.e., “6” in FIG. 11 ) in the command packet CP for broadcasting is stored.
- the “src type” field F 3 and the “srcID” field F 5 the code representing type KD PC of the main communication terminal device and the unique identifier ID PC of the main communication terminal device are stored, respectively.
- the CPU 10 broadcasts the command packet CP through the communicating section 16 .
- a request to send back the network settings at present is delivered to the sub communication terminal device (the hard disk video recorder 3 or the router 4 ) irrespective of the IP address assignment state.
- the CPU 10 awaits, as a response to the command packet CP, the affirmative acknowledgement packet APA shown in FIG. 14 which is broadcast from the sub communication terminal device.
- the “extra” field F 10 of the affirmative acknowledgement packet APA is formed by extending a 16-byte “dstID” field F 6 , a 1-byte “Setting flag” field F 12 representing the network settings at present, a 1-byte “Reserve” field F 13 , a 1-byte “IP Setting” field F 14 , a 4-byte “IP address” field F 15 , a 4-byte “netmask” field F 16 , a 4-byte “default gateway” field F 17 , a 4-byte “Dns1 address” field F 18 , a 4-byte “Dns2 address” field F 19 , a 4-byte “Proxy address” field F 20 , a 4-byte “Proxy port number” field F 21 , and a 64-byte “hostname” field F 22 .
- the “Setting flag” field F 12 a flag indicating whether the network setting may be changed is stored.
- the “reserve” field F 13 an item to be defined in future is stored.
- the “IP Setting” field F 14 an IP setting code corresponding to one of DHCP&auto-IP, static ID, and auto-IP is stored.
- the option code i.e., “3” in FIG. 11 ) for broadcasting is stored.
- the CPU 10 After the CPU 10 receives the above affirmative acknowledgement packet APA through the communicating section 16 , based on the character stored in the “xid” field F 4 of the affirmative acknowledgement packet APA, the CPU 10 determines whether the received affirmative acknowledgement packet APA responds to the command packet CP broadcast by the CPU 10 .
- the main communication terminal device serves as a sub communication terminal device to execute the updating process. This is described later.
- the CPU 10 determines whether the received affirmative acknowledgement packet APA has already been received.
- the CPU 10 discards the command packet CP. I the affirmative acknowledgement packet APA has not been received yet, the CPU 10 temporarily stores this packet in the storage memory 13 .
- the CPU 10 re-broadcasts the command packet CP after one second, two seconds, and five seconds from the time ( FIG. 12 ), and the CPU 10 awaits the affirmative acknowledgement packet APA from the sub communication terminal device.
- the CPU 10 After eight seconds pass from the initial broadcasting, the CPU 10 generates display screen data based on the temporarily stored affirmative acknowledgement packet APA, and displays, on the display section 15 , the network-settings display screen PIC 1 , shown in FIG. 18 , based on the display screen data. This notifies the user of the state of the network settings.
- the network-settings display screen PIC 1 includes a title portion such as “type X SETTING UTILITY”, a selection portion CH for selecting which is to be used between manually setting and automatically setting the network for all the communication terminal devices on the LAN, a setting changing portion EH for performing network setting for each sub communication terminal device, and various buttons such as “OK”, “CANCEL”, and “APPLY”.
- the setting changing portion EH includes a “RE-SERACH” button B 10 for re-requesting one sub communication terminal device on the LAN to send back of network settings at present, a “CHECK CONNECTING STATE” button for confirming the state of connection to the sub communication terminal device, items MIT of “LIST OF MODULES” indicating the network settings at present of the sub communication terminal device, and a “NETWORK SETTINGS” button B 12 for changing the network settings of the sub communication terminal device which is indicated by the items MIT.
- the “NETWORK SETTINGS” button B 12 can be selected, with the sub communication terminal device selected which is displayed by the items MIT of the “LIST OF MODULES”.
- a type KD is displayed as a common name based on the code in “src type” field F 3 of the affirmative acknowledgement packet APA, and “IP Setting”, “IP address”, “netmask”, “default gateway”, “Dns1 address”, “Dns2 address”, “Proxy address”, “Proxy port number”, and “hostname” in the fields F 12 to F 22 are displayed, if necessary.
- the CPU 10 When the “NETWORK SETTINGS” button B 12 is selected, with, for example, the hard disk video recorder 3 (“X3 Video Server” in FIG. 18 ) selected as a sub communication terminal device in the items MIT of the “LIST OF MODULES”, the CPU 10 generates setting-input-screen data based on the affirmative acknowledgement packet APA for the selected hard disk video recorder 3 , and requests the user to change the network settings by displaying, on the display section 15 , the setting-input screen PIC 2 , shown in FIG. 19 , based on the setting-input-screen data.
- the hard disk video recorder 3 (“X3 Video Server” in FIG. 18 ) selected as a sub communication terminal device in the items MIT of the “LIST OF MODULES”
- the CPU 10 When the “NETWORK SETTINGS” button B 12 is selected, with, for example, the hard disk video recorder 3 (“X3 Video Server” in FIG. 18 ) selected as a sub communication terminal device in the items MIT of the
- the setting-input screen PIC 2 includes a check box CH 1 for selecting whether to automatically acquire an IP address, a check box CH 2 for selecting whether to automatically acquire a domain name system (DNS), input items IT 1 to IT 5 for the IP address, a subnet mask, a default gateway, a priority DNS, and an alternative DNS, and “OK” and “CANCEL” buttons.
- the input items IT 4 and IT 5 can be selected, with the check box CH 2 selected.
- the contents in the fields F 15 to F 19 for “IP address”, “netmask”, “default gateway”, “Dns1 address”, and “Dns2 address” of the affirmative acknowledgement packet APA for the hard disk video recorder 3 selected in the items MIT of the “LIST OF MODULES” are stored. This enables the user to use the operating section 14 of the personal computer 2 to change the network settings of the hard disk video recorder 3 .
- the CPU 10 In this state, by selecting the “OK” button in the setting-input screen PIC 2 , the CPU 10 generates the command packet CP (in FIG. 13 ) based on the contents in the input items IT 1 to IT 5 and the identification-to-type correspondence table TB of the main communication terminal device.
- the “cmd dependent” field F 8 and “option” field F 9 of the command packet CP are formed by extending the “extra” field Flo of the affirmative acknowledgement packet APA.
- the “cmd dependent” field F 8 includes the “state flag” field F 12 , the “reserve” field F 13 , and the “IP Setting” field F 14 .
- the “option” field F 9 is formed by extending the fields F 15 to F 22 for “IP address”, “netmask”, “default gateway”, “Dns1 address”, “Dns2 address”, “Proxy address”, “Proxy port number” and “hostname”.
- a code corresponding to the command “SetNetConf” for requesting change of the network setting at present is stored.
- the unique identifier ID (the unique identifier ID HDR of the hard disk video recorder 3 ) of the sub communication terminal device whose network setting is changed is stored.
- the option code (i.e., “6” in FIG. 11 ) of the command packet CP for broadcasting is stored.
- the type (KD) code and unique identifier ID of the main communication terminal device are stored, respectively.
- the CPU 10 broadcasts the above command packet CP through the communicating section 16 .
- user-changed network settings of the personal computer 2 are delivered to a corresponding sub communication terminal device (the hard disk video recorder 3 ) irrespective of the IP address assignment state, and, in the sub communication terminal device, the network settings at present are changed to the changed network settings.
- the CPU 10 When the CPU 10 does not receive the affirmative acknowledgement packet APA for the command packet CP, the CPU 10 can re-broadcast the command packet CP, if necessary.
- the main communication terminal device can change the network setting of a sub communication terminal device via the LAN, if necessary.
- the CPU 10 in the sub communication terminal device receives the command packet CP ( FIG. 13 ), which includes the command “GetNetConf” for requesting network settings at present
- the CPU 10 generates the affirmative acknowledgement packet APA (in FIG. 15 ) based on the network setting state at present in accordance with the received command, and broadcasts the generated affirmative acknowledgement packet APA.
- the option code (i.e., “7” in FIG. 11 ) of the affirmative acknowledgement packet for broadcasting is stored.
- the type (KD) code and unique identifier ID of the sub communication terminal device for broadcasting the affirmative acknowledgement packet APA are stored, respectively.
- the unique identifier ID of the main communication terminal device is stored.
- the network setting state at present is stored in the form of corresponding fields F 12 to F 22 shown in FIG. 17 .
- the CPU 10 in the sub communication terminal device receives the command packet CP ( FIG. 13 ), which includes the command “SetNetConf” to request changing the network settings at present
- the CPU 10 changes the network settings at present based on the received command packet CP.
- the network settings are changed to the changed network settings in the fields F 12 to F 22 ( FIG. 17 ) for “Setting flag”, “Reserve”, “IP Setting”, “IP address”, “netmask”, “default gateway”, “Dns1 address”, “Dns2 address”, “Proxy address”, “Proxy port number” and “hostname” in the “cmd dependent” field F 8 and “option” field F 9 of the command packet CP.
- the CPU 10 can generate and broadcast the affirmative acknowledgement packet APA ( FIG. 15 ).
- the sub communication terminal device can notify the main communication terminal device of the network settings of the sub communication terminal device in response to a request from the main communication terminal device, or can change network settings of the sub communication terminal device as requested by the main communication terminal device.
- each communication terminal device stores, in the form of an identification-to-type correspondence table TB, correspondence between a unique identifier ID different from an IP address in a layer higher than a layer in which the IP address is generated, and a communication terminal device type KD.
- a communication terminal device servers as an origin with predetermined timing to transmit (broadcast) the unique identifier ID and type KD of the communication terminal device to unspecified destinations, and updates an identification-to-type correspondence table TB on the basis of the unique identifier ID and type KD of one communication party which are send back as a response from one communication party.
- the communication terminal device by using, as a trigger, a change in state of a communication terminal device, such as power supply (activation), a return from a standby state (power saving mode), or connection to the LAN, the communication terminal device servers as an origin, whereby the communication terminal device can communicate with the communication party irrespective of an IP address assignment state.
- a change in state of a communication terminal device such as power supply (activation), a return from a standby state (power saving mode), or connection to the LAN
- the communication terminal device servers as an origin, whereby the communication terminal device can communicate with the communication party irrespective of an IP address assignment state.
- the communication terminal device by using, as a trigger, the time that a communication terminal device detects a change in its state such as power supply (activation), a return from a standby state (power saving mode), or connection to the LAN, the communication terminal device serves as an origin, whereby, even if communication terminal devices are connected via a wireless LAN whose topology frequently changes, prolongation of establishment of communication can be prevented and false communication can be prevented.
- a trigger the time that a communication terminal device detects a change in its state such as power supply (activation), a return from a standby state (power saving mode), or connection to the LAN
- the personal computer 2 which detects a request to collect network setting of a communication party, broadcasts, as the command packet CP ( FIG. 13 ), a request to report network setting of a communication party (the hard disk video recorder 3 or the router 4 ) registered in the identification-to-type correspondence table TB, and displays on the display section 15 , network setting which are sent back as a response from the communication party.
- a communication party corresponding to the change is specified based on the identification-to-type correspondence table TB, the unique identifier ID and type KD of the specified communication party, and a network-setting change request are broadcast as the command packet CP ( FIG. 13 ).
- network settings of a communication party can be changed via the LAN without being directly changed.
- network setting of a new communication party connected to the network can be easily established, and, even in a state in which an IP address dynamically changes, the change can be corrected.
- a communication terminal device serves as an origin with predetermined timing and broadcasts the unique identifier ID and type KD of the communication terminal device to a communication party connected to the LAN, and updates the identification-to-type correspondence table TB based on the unique identifier ID and type KD of the communication party which are sent back as a response from the communication party, whereby the communication terminal device can communicate with the communication party on the basis of the identification-to-type correspondence table TB irrespective of the IP address assignment state.
- the IP address dynamically changes, a period up to establishment of communication can be prevented from being prolonged, and a situation of communication with a communication terminal device as an originally desired communication party can be prevented from occurring. Therefore, effectiveness of communication control can be easily improved.
- the communication terminal device may serve as an origin to initiate the updating process with timing of various types such as the time that the communication terminal device receives, from the operating section 14 , an instruction to update the identification-to-type correspondence table TB, each predetermined period, and a combination of these.
- an identification information generating means (the CPU 10 (the communication control section CC)) that generates second identification information different from first identification information on the basis of information unique to a communication terminal device generates a unique identifier ID different from an IP address on the basis of an MAC address.
- the present invention is not limited to this case, and a manufacture's serial number of the communication terminal device may be directly used as an initial unique identifier ID.
- the main communication terminal device initiates the network-setting changing process when detecting, from the user interface YI 2 , a request to collect network setting.
- the present invention is not limited to this case, and the main communication terminal device may initiate the network-setting changing process when receiving a network-setting collecting request transmitted from the sub communication terminal device.
- timing with which, for example, the sub communication terminal device transmits the network-setting collecting request to the main communication terminal device for example, the time that the unique identifier ID stored in the “dstID” field F 6 of the received command packet does not coincide with the unique identifier ID of the sub communication terminal device registered in the identification-to-type correspondence table TB, or the time that the sub communication terminal device detects a change in its state may be employed.
- a technique in which the network-setting collecting request is stored in the “reason” field F 1 l of the acknowledgement packet for the command packet and the acknowledgement packet is unicast, or a technique in which the sub communication terminal device unicasts the network-setting collecting request as a command packet may be employed.
- communication terminal devices such as cellular phones, personal digital assistants (PDAs), household electronic devices having communication functions, and other types of communication terminal devices, may be connected to one another by networks such as IEEE (Institute of Electrical and Electronics Engineers) 1394 and other types of networks.
- IEEE Institute of Electrical and Electronics Engineers
Abstract
Description
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JP2008035011A (en) * | 2006-07-27 | 2008-02-14 | Kawamura Electric Inc | Monitoring device |
CN101595369B (en) * | 2007-02-15 | 2011-09-28 | 日本先锋公司 | Communication terminal device, communication management device, communication method |
CN101282240A (en) * | 2008-05-15 | 2008-10-08 | 华为技术有限公司 | Method, equipment and system for managing network apparatus |
US9727107B2 (en) * | 2010-08-24 | 2017-08-08 | Nec Corporation | Slave device requesting its master device not to cancel its power saving mode |
US8769060B2 (en) * | 2011-01-28 | 2014-07-01 | Nominum, Inc. | Systems and methods for providing DNS services |
CN106453021A (en) * | 2016-07-27 | 2017-02-22 | 青岛海信移动通信技术股份有限公司 | Internet of things device control method and device |
US11637907B2 (en) * | 2016-11-16 | 2023-04-25 | Verizon Patent And Licensing Inc. | Systems and methods for tracking device IDs for virtualized applications |
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